Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Taxes [Line Items]
Reversal of valuation allowances		$ 16
Tax expense charged to OCI		14		14
Income tax benefit allocated to operations		7		7
Tax benefit deferred in other current liabilities		7		7
Income tax (benefit) expense	29	(4)	91	10
U.S. federal statutory rate			35.00%
U.S. federal income and non-U.S. withholding tax liability adjustments on future repatriations, expense (benefit)	$ 1	$ (1)	$ 1	$ 2